Improvement in gibs for cross-heads



UNITED STATES PATENT OFFICEO WILLIAM R. BISHOP, OF SHERWOOD, WISCONSIN.

l Specification forming part of Letters Patent No. 55,992, dated July 3, 1866.

To all whom it may concern:

Be it known that I, WILLIAM R. BISHOP, of Sherwood, Calumet county, State of Wiscousin, have invented a new and useful Improvement in Gibs and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l represents a side elevation of a cross-head provided with my improved gib. Fig. 2 is a detached longitudinal section of my gib on a larger scale than the previous iigure. Fig. 3 is a transverse section of the same.

Similar letters of reference indicate like parts.

This invention consists in the application and use of leather on theworking-face of a gib in such a manner that a self-lubricating gib is obtained which will work with less friction and which is less liable to Wear out than an ordinary gib.

A represents a gib of that class generally employed for cross-h eads of steam-engines and for similar parts of other machines. Such gibs are usually made of brass, sometimes of cast liron or steel, and in few instances ot' hard wood, and it is well known to practical engineers that said gibs are liable 'to heat when not'properly oiled, and that they wear out at short intervals, so that the same have to be replaced at shorter or longer intervals. This N difficulty is avoided by` my gib, the workingt'ace of which is protected by a strip, a, of leather, which is secured to the body of the gib by rivets, screws, or any other suitable means. By this strip ot' leather my gibs are rendered self-lubricating, and they run with less friction than any other gib known to lne.

According` to my present experience, a gib with a leather face can be run at a great speed fora lon g time without perceptible wear. I have myself` run an engine with a piston-speed of from seven hundred to seven hundred and t'ty feet per minute for four months with gibs laid with a single thickness of common beltleather.

What I claim as new, and desire to secure by Letters Patent, is

A gib composed of a Inetal body, A, and strip of leather a, substantially as and for the purpose described.

WM. R. BISHOP. Witnesses:

Cuts. SHOEMAKER,

ALFRED GALPIN. 

